feat: gracefully handle expired token exception

[jshah4517]

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[Copilot]

Pull request overview

This PR updates Pollcast’s socket ID verification flow to treat expired JWT socket tokens as an authentication failure (401) rather than an unhandled error, and adds functional coverage for the new behaviors.

Changes:

• Add ExpiredSocketException and throw it when JWT decoding fails specifically due to expiration.
• Update VerifySocketId middleware to return structured JSON 401 responses for invalid/expired socket IDs.
• Expand functional tests to cover missing/invalid/expired/malformed JWT socket ID headers and missing id claim cases.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
tests/Functional/VerifySocketIdMiddlewareTest.php	Updates expected status codes to 401 and adds new test cases for expired/malformed/missing-claim JWTs.
src/Http/Middleware/VerifySocketId.php	Converts socket validation failures into JSON 401 responses; adds special handling for expired tokens.
src/Exception/ExpiredSocketException.php	Introduces a dedicated exception type for expired socket JWT tokens.
src/Broadcasting/Socket.php	Differentiates expired JWT decode failures from other JWT decode errors.

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